linux-kernel - [PATCH v1 3/4] powerpc/boot: Add bzip2 support for uImage

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Message-Id: <ae716c2d05cc7591b3eb2f4512491e93a687e935.1553848759.git.christophe.leroy@c-s.fr>
Date:   Fri, 29 Mar 2019 08:40:23 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 3/4] powerpc/boot: Add bzip2 support for uImage

This patch allows to generate bzip2 compressed uImage

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/Kconfig       | 1 +
 arch/powerpc/boot/Makefile | 2 ++
 arch/powerpc/boot/wrapper  | 8 +++++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 69ff2476490c..6f1d49fdae98 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -202,6 +202,7 @@ config PPC
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_XZ			if PPC_BOOK3S || 44x
 	select HAVE_KERNEL_LZMA			if DEFAULT_UIMAGE
+	select HAVE_KERNEL_BZIP2		if DEFAULT_UIMAGE
 	select HAVE_KPROBES
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_KRETPROBES
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 9b7b11a22925..0a7f8c2dc8af 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -23,6 +23,7 @@ all: $(obj)/zImage
 compress-$(CONFIG_KERNEL_GZIP) := CONFIG_KERNEL_GZIP
 compress-$(CONFIG_KERNEL_XZ)   := CONFIG_KERNEL_XZ
 compress-$(CONFIG_KERNEL_LZMA) := CONFIG_KERNEL_LZMA
+compress-$(CONFIG_KERNEL_BZIP2)   := CONFIG_KERNEL_BZIP2
 
 ifdef CROSS32_COMPILE
     BOOTCC := $(CROSS32_COMPILE)gcc
@@ -259,6 +260,7 @@ endif
 compressor-$(CONFIG_KERNEL_GZIP) := gz
 compressor-$(CONFIG_KERNEL_XZ)   := xz
 compressor-$(CONFIG_KERNEL_LZMA)   := lzma
+compressor-$(CONFIG_KERNEL_BZIP2) := bz2
 
 # args (to if_changed): 1 = (this rule), 2 = platform, 3 = dts 4=dtb 5=initrd
 quiet_cmd_wrap	= WRAP    $@
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index 51dc42f5acbc..d1384e8c0c6f 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -137,7 +137,7 @@ while [ "$#" -gt 0 ]; do
     -Z)
 	shift
 	[ "$#" -gt 0 ] || usage
-        [ "$1" != "gz" -o "$1" != "xz" -o "$1" != "lzma" -o "$1" != "none" ] || usage
+        [ "$1" != "gz" -o "$1" != "xz" -o "$1" != "lzma" -o "$1" != "bz2" -o "$1" != "none" ] || usage
 
 	compression=".$1"
 	uboot_comp=$1
@@ -149,6 +149,9 @@ while [ "$#" -gt 0 ]; do
 	if [ $uboot_comp = "gz" ]; then
 		uboot_comp=gzip
 	fi
+	if [ $uboot_comp = "bz2" ]; then
+		uboot_comp=bzip2
+	fi
 	;;
     --no-gzip)
         # a "feature" of the the wrapper script is that it can be used outside
@@ -377,6 +380,9 @@ if [ -z "$cacheit" -o ! -f "$vmz$compression" -o "$vmz$compression" -ot "$kernel
     .lzma)
         xz --format=lzma -f -6 "$vmz.$$"
 	;;
+    .bz2)
+        bzip2 -f "$vmz.$$"
+	;;
     *)
         # drop the compression suffix so the stripped vmlinux is used
         compression=
-- 
2.13.3